Add third_party/llvm-libclang GCS dependency

Add llvm-libclang to DEPS and roll_chromium_deps.py so V8 metagen
has libclang available for instance-type generation.

Fixes: 568302852
Change-Id: Iad61684641daa7dc2645970fe1285550d58d6b1c
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/347895
Reviewed-by: dan sinclair <dsinclair@chromium.org>
Commit-Queue: Steven Perron <stevenperron@google.com>

.gitignore

diff --git a/.gitignore b/.gitignore
index 4ee56bd..b1cf838 100644
--- a/.gitignore
+++ b/.gitignore
@@ -48,6 +48,7 @@
 /third_party/litert-lm/src
 /third_party/llvm-build
 /third_party/llvm-dev
+/third_party/llvm-libclang
 /third_party/markupsafe
 /third_party/mesa/src
 /third_party/meson/src

DEPS

diff --git a/DEPS b/DEPS
index cff4581..3f4b61b 100644
--- a/DEPS
+++ b/DEPS
@@ -872,6 +872,42 @@
     'url': '{chromium_git}/chromium/src/third_party/simdutf@f7356eed293f8208c40b3c1b344a50bd70971983',
     'condition': 'dawn_standalone and checkout_v8',
   },
+
+  'third_party/llvm-libclang': {
+    'dep_type': 'gcs',
+    'bucket': 'chromium-browser-clang',
+    'condition': 'dawn_standalone and checkout_v8',
+    'objects': [
+      {
+        'object_name': 'Linux_x64/rust-libclang-1edd55dcfcd573872c727fa3e086369a71661ee0-2-llvmorg-24-init-7747-g62397f8b.tar.xz',
+        'sha256sum': '59c2086dabf6494fb7cc4690910d4dfddd9a598a1ecaf19d8408197445bbf7c3',
+        'size_bytes': 22899948,
+        'generation': 1789143385954506,
+        'condition': 'host_os == "linux" and non_git_source',
+      },
+      {
+        'object_name': 'Mac/rust-libclang-1edd55dcfcd573872c727fa3e086369a71661ee0-2-llvmorg-24-init-7747-g62397f8b.tar.xz',
+        'sha256sum': '6fa15d9cf2ff55b5ae1e4276369cfbde1f4f770e60ccb133e1fc7446c5ce607e',
+        'size_bytes': 23309500,
+        'generation': 1789143389794597,
+        'condition': 'host_os == "mac" and host_cpu == "x64"',
+      },
+      {
+        'object_name': 'Mac_arm64/rust-libclang-1edd55dcfcd573872c727fa3e086369a71661ee0-2-llvmorg-24-init-7747-g62397f8b.tar.xz',
+        'sha256sum': 'd330fd41100be52b4e804c9252b3f3bb34cfed16d2973934de0930b297f7201e',
+        'size_bytes': 20689276,
+        'generation': 1789143393459608,
+        'condition': 'host_os == "mac" and host_cpu == "arm64"',
+      },
+      {
+        'object_name': 'Win/rust-libclang-1edd55dcfcd573872c727fa3e086369a71661ee0-2-llvmorg-24-init-7747-g62397f8b.tar.xz',
+        'sha256sum': 'fbe9978289a35ca45da1c1393ed6ef8adc86907d36a4ce81fcf590f56b07a096',
+        'size_bytes': 21677148,
+        'generation': 1789143397092006,
+        'condition': 'host_os == "win"',
+      },
+    ],
+  },
 }
 
 hooks = [

scripts/roll_chromium_deps.py

diff --git a/scripts/roll_chromium_deps.py b/scripts/roll_chromium_deps.py
index 10464ef..5a218d3 100755
--- a/scripts/roll_chromium_deps.py
+++ b/scripts/roll_chromium_deps.py
@@ -121,6 +121,7 @@
     'build/linux/debian_bullseye_mipsel-sysroot',
     'build/linux/debian_bullseye_mips64el-sysroot',
     'build/linux/debian_bullseye_amd64-sysroot',
+    'third_party/llvm-libclang',
 }
 
 # Files that are copied from Chromium directly. A map from Dawn file path to